Can not open document with non-english characters in filename

Interesting. Well I have a dedicated ö key on my keyboard. Will test around with character codes.

Just tested with filenames containing the sequence U+006F, U+0308 on Win 10.
The OS accepts that.
LibO V 7.0.1 (64bit) and LibO V 6.4.4 (x64) both handle it, too.
The behaviour of the cursor going over a U+0308 is slightly different, though. Anyway the effects may depend on the OS.

My old general and serious advice:
Use only syntactically clean names for folders and files: No spaces or special characters at all, whether the system and other software pretend to accept them or not. No use in localization spilling over!
Unfortunately we cannot make undone the lots of pointless stubborn “extensions” to the latin alphabet invented over centuries. They simply are a plague.

@Lupp wrote:

My old general and serious advice:

Use only syntactically clean names for folders and files: No spaces or special characters at all, whether the system and other software pretend to accept them or not. No use in localization spilling over!
+1

If you work in the cloud of an association you can not just go to everybody and tell them:
hey, btw I can not open files with an “ü” so please never use an “ü” again and rename all files and folders containing one, because I can’t fix my LO.

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And I can’t go to MS or any Clouder and invoke them to no longer try to turn the mess they made themselves into a weapon against free software.
What should be an accepted name in a technical context must clearly and bindingly be specified. A string used for a specific purpose must not be a letter to uncle أنور. Did you consider the big mess you would get as soon as right to left writing is mixed in?
Let’s tidy it up. “Asiatic” and “Complex” text layout may be needed in many places. An identifier is not the right place, and that’s not “Western arrogance”. I’m surely ready to start writing right to left as soon as there is a global agreement. Till then I can forswear special German characters not easily accessible from a majority of keyboards in the world when typing a technical name.